High-Gain and High-Bandwidth AlGaN/GaN High Electron Mobility Transistor Comparator with High-Temperature Operation

This paper presents the dc and dynamic characterizations of a GaN-based voltage comparator, fabricated with monolithic integration of enhancement-mode (E-mode) and depletion-mode (D-mode) AlGaN/GaN high electron mobility transistors (HEMTs). The comparator features high gain (>31 dB) and wide bandwidth (>4 MHz), and small propagation delay time (<20 ns) over a wide temperature range up to 250 °C. Its dc gain is still 27.1 dB at 400 °C. These results demonstrate the potential of the AlGaN/GaN HEMT technology for mixed-signal integrated circuits used in GaN power electronics that promises high-voltage, high-current, and high-temperature operation.